Fluid-fuel burner



April 15 1924.

J. F. STRAITZ FLUID FUEL BURNER Original Filed May 21, 1920 Inventor 2m 5105 m2 M .ifiorn y.

l 3o lieatin Patented Apr. 15, 1924.

UNITED STATES PATENT OFFICE.

JOHN F. STRAITZ, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO NATIONAL AIROIL BURNER COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF DELAWARE.

FLUID-FUEL BURNER.

Application filed may 21, 1920, Serial No. 388,187. Renewed September 18, 1928.

T all whom it may concern:

Be it known that I, JOHN F. STRAITZ, a citizen of the United States, residing at Philadelphia, in the county of Hiiladelphia,

State of Pennsylvania, have invented a new and useful Fluid-Fuel Burner, of which the following is a specification.

My invention relates to improvements in fluid fuel burners. The object is to provide 1 improved means for thoroughly breaking up the particles of fluid fuel and mixing the same with a fluid agent so that the mixture will be delivered to the combustion chamber in the form of vapor.

The device is especially applicable to the burnin of crude oils.

The invention comprises means for compressing and then expanding the mixture to cause a thorough mingling of the fluid agent I with the fluid fuel, to cause a churning of said mixture into a substantial emulsion.

The invention comprises means for adJusting the amount of fluid fuel that shall be drawn into the mixing chamber by the B6 stream df fluid agent injected thereto so that a complete atomization of the fluid fuel is secured at a minimum expenditure of fluid agent, such as compressed air or steam.

The invention comprises means for prethe burnerbefore the introduction of fluid fuel thereto and for thoroughly cleanin the burner, after use.

The invention comprises other details of construction.

In the drawings, which by way of example, asuitable embodiment of my invention Fig. 1 is a side elevation.

Fig. 2 is a longitudinal section.

Fig. 3 is a vertical cross-section on line 3-3 o fFig. 1.

Fig.4 is anend elevat1on.

Fig. 5 is a horizontal section on line 55 of Fig. 2. g

45. Similar numerals refer to similar parts throughout the several views.

The chambered body 5 is provided with the fluid fuel intake nozzle 6, and the fluid fuel chamber 7. At one end it is provided so with the exteriorly threaded end 8 for re- -ceivingthe cap' member 9 rovided with the interior-l threaded nozz e 10, and the assage or c annel 11:- Within-the chamered body 5 is fitted the nozzle member 12 illustrate merely having a channel 13 registering with channel 11 of member 9. Threaded into the other end of member 5 is the nozzle member 14, having a rearwardly extending annular flange 15 surrounding but spaced away from the tapered discharge end of nozzle 12. The forward end of nozzle member 14 is provided with a suitable dischar vent- 16 which, in the present example, is shown as a narrow horizontal slit.

Nozzle member 14 is also provided. with a channel leadin from the annular flan ed portion 15 to t e vent 16. This channe is shown as slightly flaring as at 17 at its flanged end, contracted at its intermediate partas at 18,, and enlargedinto a mixing chamber as at 19. In other words the channel leading from the discharge end of nozzle i2bto the vent 16 is in the form of a Venturi It will be noted that the threaded engagement of nozzle member 14 with the chambered body 5 is adjustable, so that the flanged portion 15 may be moved longitudinally with respect to the tapered nozzle of member 12 which serves to increase or diminish the annular space between flange 15 and said nozzle and thus serves to regulate the flow of fluid fuel from chamber 7 to channel 17.

It will also be noted that the cap member 9 serves to hold the nozzle member 12 in position in the chambered body 5.

In operation.

In operating for enerating steam, steam is the-most convenient and preferable fluid agent, while crude oil is the most available fluid fuel.

The steam is introduced at nozzle or port 10, passes through channels 11, 13, 17, 18 and 19 and passes out through vent 16. The preliminary passa e of steam through the device is permitted until the tem erature of the whole burner structure is rought to about 250 F. For this purpose the steam valve, not shown, which controls the passage of steam to nozzle or port 10 is only opened slight] to permit the steam to play through t e burner to bring it up to the temperature mentioned.

The steam valve is then opened further to vs the necessary pressure to operate the urner.

rounds the stream of steam issuin ing or enve oping film of oil, thus the vent, in the form of a fan The oil cock, not shown which controls the flow to port or nozzle 6, is opened gradually until the proper proportion of oil and steam feed is secured.

The oil flowing into chamber 7, becomes highly heated and partially 'va orized by contact with the hot walls of sai chamber. It flows in a thin annular stream throu h the passage between the nozzle 12 and t e flange 15. This thin annular film of oilfsurrom channel 13 of nozzle 12 into channel 1 The steam issuing from nozzle 12 into channel 17 tends to ex and and work into the surroundbe inning the formation of a mixture of oil am? steam. As the oil and steam enter the contracted throat 18, the mixture 'is compressed and the particles more intimately associated as the mixture emerges into the enlarged chamber 19 the partic es expand and a further and more intimate admixture of the particles of oil and steam takes place. In fact the mixture is churned into an emulsion. The contracted vent retards the flow of the mixture from chamber 19. This results in a further compression and then a discharge through shaped vapor which upon ignition, burns with a clear flame, leaving practically no smoke or residue: all of the fuel is consumed without clogging the burner or forming any accumulation of carbon inside the combustion chamber.

The adjustment of the nozzle 14 with respect to chambered body 5, secures the desired or required space between the margin of flan e and the tapered wall of nozzle 12. T e space re uired dependin upon the character of the uid fuel or by ro-carbon used. The combustion chamber will attain a white heat and there will be no smoke.

When it is desired to shut off the burner, the oil valve is closed tight and the steam is permitted to play through the burner for a s iort time, approximately a half a minute. This will clean the burner entirely free from oil, whereupon the steam cock is closed.

Where it is desired to use the burner in connection with the metallurgical art, it is usually desirable to use compressed air as the fluid agent instead of steam. The principle of operation however is practically the same.

What I claim is In an oil burner, the combination of a chambered body, having a burner nozzle and vent at one end thereof, a steam inlet port at the other end, and a fuel inlet )ort )etween the two ends, means forming a ongitudinally extending channel from the burner vent, enlarged near the burner vent and contracted midway its extension, an annular flange formation at the inner end of the said channel projecting past the fuel inlet port, and a tapered nozzle connected with the steam inlet port and projecting a substantial distance within said annular flange formation and discharging toward the burner vent.

JOHN F. STRAITZ.

Certificate of Correction.

It' is hereby certified that in Letters Patent No. 1,490,683 granted April 15, 1924, upon the application of John F. Straitz,'of Philadelphia Pennsylvania, errors aopear requiring correction as follows: In the at, heading to the printeii specification and preamhle, title of invention, for luid-Fuel Burner read Fluid-Fuel Burner and Method of Burning Fluid Fuel; age 1, lines 10, 17, and 22, before the word means" insert the words method a page 2, line 56, before the worci In insert the numeral and period 1.; same page, after line 70 insert the following as claim 2:

2. The method of burning fluid fuel which consists in introducing the fuel into a region heated by a fluid agent and in a path. of travel opposite to that of the fluut agent, then drawing the fuel from said region through a confined thin cylindmcal path of substantial length by the inductive action of said fluid agent under preseure, so that the fuel will form a. peripheral skin mn'r'oundz'ng the fluid agent/[mi a substantial part of their joint travel, then com resez'no the fluid aqent and toward their common axis, then expanding rm a ghin conqrreasing the some to facilitate turbulence and thorough mixing, and then projecting the mixture in the form, of vapor for combustion amd that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofiioe.

Signed and sealed this 15th day of July, A. D. [SEAL] THOMAS E. ROBERTSON,

Commissioner of Patents. 

